import numpy as np

# 辐射传输模型
def radiation_transport_model(environment_data, radiation_source_properties):
    water_temperature = environment_data['temperature']
    current_speed = environment_data['wind_speed']
    source_strength = radiation_source_properties['source_strength']
    half_life = radiation_source_properties['half_life']

    decay_constant = np.log(2) / half_life
    radiation_concentration = source_strength / (4 * np.pi * current_speed) * np.exp(-decay_constant * water_temperature)
    return radiation_concentration